648 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



TABLE FOR SEPARATING THE FAMILIES OF THE TENTHREDINOIDEA. 



a. Front wings with the free part of vein Rj present . X YELID^ 



aa. Front wings with the free part of vein R2 always wanting. 



b. Front wings with the base of subcosta present as a distinct vein LYDID^E 



bb. Front wings with the base of subcosta wanting, if present, only as a pale indis- 

 tinct line; the subcosta is represented only by the free part of the vein Scj, 

 which is like a cross-vein near the apex of the costal area, and even this is 

 sometimes wanting. 

 c. Front wings with the radial cross-vein ending in the cell R4, very rarely in 

 the cell R3; the medio-cubital cross-vein joined to the vein Sc-j-R+M or to 

 the vein M; if joined to the vein M, the transverse part of the vein M not 

 more than one-sixth the length of the cross-vein. 

 d. Front wings with the medio-cubital cross-vein joining media distinctly 

 beyond the point of separation of radius and media; the cell 1st R1+R2 

 blunt at apex; the veins surrounding the front margin of the cell M^ in 



the form of a semicircle, BLASTICOTOMI D^ 



dd. Front wings with the medio-cubital cross-vein either joined to the vein 

 Sc+R+M or to the vein M in the angle between radius and media; the 

 cell 1st Ri f R2 always pointed at apex; the veins surrounding the front 

 margin of the cell M^ never semicircular but always with prominent 



angles before TENTHREDINID.E 



cc. Front wings with the radial cross-vein ending in the cell R5, rarely in the cell 

 R4; and, if so, with the medjp-cubital cross- vein joining media distinctly 

 beyond the radius and subequal in length to the transverse part of media. 

 d. Front wings with the transverse part of the vein M^ present. 

 e. Front wings with the medio-cubital cross-vein subequal in length witli 

 the transverse part of media; the portion of the radial sector between 

 the stigma and the anterior end of the radio-medial cross-vein always 

 distinctly less than the portion between this cross- vein and the posterior 

 end of the radial cross-vein, or when the radial cross-vein is wanting, less 

 than the portion between the radio-medial cross-vein and the anterior 

 end of the free part of the vein R5, resulting in the apex of the cell R 

 extending but little beyond the base of the cell 1st Rj, or if the radio- 

 medial cross-vein be wanting, the cell R+R5 extending but little 

 beyond the apex of the cell 1st Rj. 

 /. Front wings with the free part of the vein Scj present and situated near 

 the point of the separation of radius and media; the base of media 

 . extending longitudinally and separating from radius distinctly before 

 the anterior end of the medio-cubital cross-vein; the radio-medial 

 cross-vein, when present, transverse and not appearing as the base of 



the radial sector XIPHYDRIID.E 



f. Front wings with the free part of the vein Sc^ wanting; the base of 

 media extending transversely and separating from radius either oppo- 

 site or beyond the anterior end of the medio-cubital cross- vein; the 

 radio-medial cross-vein oblique and appearing as the base of the 

 radial sector. 

 g. Front wings with the area between costa and the vein Sc+R+M 

 hardly more than a line; the cell 2d R1+R2 of both wings either 

 appendiculate or extending to the apex of the wing; the free part 

 of the vein M^+Cuj joined to the cell 1st A near its base, never 

 more than twice the length of the free part of the second anal 

 vein from its base SIRICID^E 



